• Here are a few options
• all natural for South American Spanish
• with slight variations in wording: 1. **Alguna que otra bolita
• leves marcas en el reverso.** * *This is probably the most direct and common way to say it.* "Bolita" is the standard term for a fabric bobble/pill. "Alguna que otra" means "the odd one" or "a few here and there." "Leves marcas" means light marks. "En el reverso" means on the back/reverse side. 2. **Pequeñas bolitas
• ligeras marcas en la parte de atrás.** * *Similar to the first
• using "pequeñas" (small) and "ligeras" (light) for emphasis
• and "en la parte de atrás" (on the back part).* 3. **Algunas pelotitas
• pequeñas marcas en la espalda.** * *"Pelotitas" is another very common term for bobbles in some South American countries. "En la espalda" means on the back (of the shirt/body).* All three are perfectly understandable and natural for describing minor defects on a football shirt in South America. I'd lean towards the first one as the most universally applicable.

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